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The coefficient of viscosity for hot air is
- a)greater than the coefficient of viscosity for cold air
- b)smaller than the coefficient of viscosity for cold air
- c)same as the coefficient of viscosity for cold air
- d)increase ur decrease depending on the external pressure
Correct answer is 'A'. Can you explain this answer?
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The coefficient of viscosity for hot air isa)greater than the coeffici...
A correct because hot air have more water vapours and hence humid air tends to feel thicker
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The coefficient of viscosity for hot air isa)greater than the coeffici...
The coefficient of viscosity for hot air is greater than the coefficient of viscosity for cold air.
Explanation:
Viscosity is a measure of a fluid's resistance to flow. It is influenced by several factors, including temperature. The coefficient of viscosity is a constant that relates the shear stress to the rate of shear strain in a fluid.
When the temperature of a gas increases, its molecules gain kinetic energy and move more rapidly. This increased molecular motion leads to greater collisions between the gas molecules, resulting in an increase in the viscosity of the gas.
Effect of temperature on viscosity:
- As the temperature of a gas increases, the average speed of its molecules also increases.
- This increased molecular speed leads to more frequent and energetic collisions between the gas molecules.
- The increased collisions result in a greater resistance to flow, thus increasing the viscosity of the gas.
- Conversely, when the temperature of a gas decreases, the average molecular speed decreases, leading to fewer and less energetic collisions and a decrease in viscosity.
Hot air vs. cold air:
- Hot air has a higher temperature than cold air, which means its molecules are moving more rapidly.
- The increased molecular motion in hot air leads to more frequent and energetic collisions, resulting in a greater resistance to flow and a higher coefficient of viscosity.
- Cold air, on the other hand, has lower molecular motion, leading to fewer and less energetic collisions, resulting in a lower coefficient of viscosity.
Therefore, the coefficient of viscosity for hot air is greater than the coefficient of viscosity for cold air. This is because the increased molecular motion in hot air leads to a greater resistance to flow compared to cold air.
Explanation:
Viscosity is a measure of a fluid's resistance to flow. It is influenced by several factors, including temperature. The coefficient of viscosity is a constant that relates the shear stress to the rate of shear strain in a fluid.
When the temperature of a gas increases, its molecules gain kinetic energy and move more rapidly. This increased molecular motion leads to greater collisions between the gas molecules, resulting in an increase in the viscosity of the gas.
Effect of temperature on viscosity:
- As the temperature of a gas increases, the average speed of its molecules also increases.
- This increased molecular speed leads to more frequent and energetic collisions between the gas molecules.
- The increased collisions result in a greater resistance to flow, thus increasing the viscosity of the gas.
- Conversely, when the temperature of a gas decreases, the average molecular speed decreases, leading to fewer and less energetic collisions and a decrease in viscosity.
Hot air vs. cold air:
- Hot air has a higher temperature than cold air, which means its molecules are moving more rapidly.
- The increased molecular motion in hot air leads to more frequent and energetic collisions, resulting in a greater resistance to flow and a higher coefficient of viscosity.
- Cold air, on the other hand, has lower molecular motion, leading to fewer and less energetic collisions, resulting in a lower coefficient of viscosity.
Therefore, the coefficient of viscosity for hot air is greater than the coefficient of viscosity for cold air. This is because the increased molecular motion in hot air leads to a greater resistance to flow compared to cold air.
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